<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style media="screen">
        body {
            font-family: cursive;
            font-size: 14px;
        }

        .left {
            width: 150px;
            height: 32px;
            background: #fff;
            position: relative;
            margin: 50px 0 0 50px;
            line-height: 50px;
            text-align: center;
            border: 1px solid green;
            border-radius: 5px;
        }

        .left:before,
        .left:after {
            content: '';
            position: absolute;
            width: 0;
            height: 0;
            top: 10px;
            border: 5px solid;
            border-color: transparent green transparent transparent;
        }
        .left:before{
            left: -10px;
        }
        .left:after {
            left: -9px;
            border-color: transparent #fff transparent transparent;
        }
    </style>
</head>

<body>
    <div class="left"></div>
</body>

</html>
